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Business Combinations - Narrative (Details) - Bright Health Medicare - USD ($)
$ in Millions
3 Months Ended
Jan. 01, 2024
Mar. 31, 2024
Business Acquisition, Contingent Consideration [Line Items]    
Cash paid for acquisition $ 441  
Acquisition costs   $ 1
Contingent consideration liabilities 100  
Consideration transferred 86  
Third-party escrow 100  
Acquired receivable, fair value $ 14